Knauf shoots his multi-sniper rifle using stun ammo and marksmanship l1. Am I right that the target takes an arm save and a bts save - so is potentially both wounded and stunned? And, in Hunting Party if Knauf is lucky enough to shoot a shock immune specialist, he could potentially render them unconscious and immobilized in one hit, preventing them from subsequently resetting to escape the immobilization? I'm pretty sure that's how it works, but I wanted to check :-)
From the MM1 rule: However, these benefits do not apply to BS Weapons with any of these Traits: Throwing Weapon, Technical Weapon,and Non-Lethal. So MM1 has no effect on Stun ammo.